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DESIGN STUDY. VOLUME 3: MACHINERY AND SYSTEMS

Machinery, systems, and controls were investigated as part of a feasibility study for converting the H.S. Denison from a 60 to an 80 knot vehicle. Investigations ranged from overall systems studies such as foil control linkage and craft steering systems, to detail part studies such as the foil control actuator and the control rod seal. Parallel machinery studies were made for comparative purposes. The steering system was changed from a fixed strut with rudder flaps to an all steerable aft strut and propeller pod for improved performance at high speeds. Controlled incidence, submerged foils provided optimum hydrodynamic characteristics for the forward foil control linkage. A tractor propeller configuration was selected over a pusher propeller for the aft foil control linkage. Linear actuators for incidence foil actuation lend themselves physically to incidence application, offer more reliability, and are less expensive than rotary hydraulic actuators. The foil borne hydraulic system was changed from a 100 H.P. with two pumps driven by the main engine to a 300 H.P. system with three pumps driven by a single idler gearbox. The control loads of the submerged foils at 80 knots led to the increase in system capacity. Steering and foil borne propusion system schematics are provided.

Supplemental Notes:

This document is available for review at the Department of Commerce Library, Main Commerce Building, Washington, D.C., under reference number D-9-D-Vol-3.